Educational device.



C. I. SPOOR & P. A. TRAUTMAN.

EDUCATIONAL DEVICE. APPLICATION FILED MAY 7.1917.

Patented June 25, 1918 lnvenrors 601-0 JJpoor & P/l. Wan/Imam 7 V y/ff:

TED STATES PATENT orFroE.

CORA J. SPOOR AND PAUL A. TRAUTMAN, 0F DES MOIN ES, IOWA.

EDUCATIONAL DEVICE.

To all whom it may concern:

Be it known that we, Cora J. SPOOR and PAUL A. TRAUTMAN, citizens, respectively, of the United States and the Dominion of Canada, and residents of Des Moines, in the county of Polk and State of Iowa, have invented a certain new and useful Educational Device, of which the following is a specification.

The object of our invention is to provide an educational device of comparatively, simple, durable and inexpensive construction, comprising a supportin frame having at the upper ortion thereo a plurality of disks arrange opposite sight openings for displaying through the sight holes various indicating characters represented on the disks.

With this and other objects in view our invention consists in the construction, arrangement and combination of the various parts of the device, whereby the objects contemplated are attained, as hereinafter more fully set forth, pointed out in our claim, and illustrated in the accompanying drawings, in which:

Figure 1 shows a front elevation of our improved device, the base member being shown in section.

gig. 2 shows a side elevation of the same, an

Fig. 3 shows a rear elevation.

In the accompanying drawings, we have used the reference numeral 16 to indicate enerally a pair of spaced base members. Secured to the base members are upright standards 17 connecting at their upper ends with a cross member 2 and between their ends by a cross member 3 spaced below the member 2. The upper portion of the uprights 17 and the cross members 2 and 3 form a substantially rectangular frame, the inner edges of the front faces of which are beveled at 17* as shown in Fig. 1.

Secured to the back of said frame is a plate 15. Mounted on said plate is a series of disks 14., arranged substantially as shown in Fig. 3.

Extended through the late 15 for each disk is a plate 10, rotata 1y mounted and supported on the disk, as shown in Fig. 2, and having on its rear end a handle 9, whereby the disks may be rotated. The lower disks overlap the upper disks, as shown in Fig. 2, for saving space, and we have, therefore, mounted on the plate 15 be- Specification of Letters Patent- Patented June 25, 1918- Application filed May 7, 1917. Serial No. 167,116.

tween the lower disks and said plate spacing members 13. The disks 14 have on their front and rear surfaces indicating numerals or the like, as shown. The numerals on the back are arranged to correspond with the numerals on the front.

Mounted on the front face of the plate 15 near the upper and lower portions thereof are spaced guide blocks 4, having their adjacent edges beveled from their outer surfaces inwardly and toward the plate 15.

Spaced substantially midway between the guide blocks 4 is a guide block 5 having its edges adjacent to the blocks 4 beveled inwardly and toward the plate 15.

Slidably mounted between each block 4 and adjacent the block 5 are two cover plates 6 having handles 7 for convenience in sliding the plates 6.

he plate 15 is provided with suitable sight openings 15 preferably arranged in horizontal pairs adjacent to each other, as shown in Fig. 1 and adapted to be covered by the cover plates 6.

The parts are so arranged that in the practical operation, of our improved device, any or all of the sight openings 15' may be closed by means of the cover plates 6. The teacher stands back of the device and rotates the disks 14 to position for bringing any desired numeral or indicating character opposite the respective sight openings 15, for making any desired combination or variety of combinations of the numerals for mathematical exercises.

It will be seen that by adjusting the cover plates 6 a vast number of combinations of numerals may be made, and that in either of the upper or the lower sight openings there may be displaced any combination of numerals from 0 to 109.

Some changes may be made in the construction and arrangement of our improved invention without departing from the essential features and purposes therof, and it is our intention to cover by this application any modified forms of structure which may be included within the scope of our claim.

We claim as our invention:

An educational device comprising a plate, a pair of disks rotatably mounte on said plate on the rear surface thereof, said disks having corresponding indicating characters on their front and rear surfaces adjacent to their edges, said disks being so arranged that their peripheries at one point are adjacent to each other, a second pair of disks front of the plate, and adjustable cover rotatably mounted on the rear surface of inembers on said plate, each being adapted 10 said p1ate,-be10W-the respective disks-oftheinone position of its movement to cover the first pair, having corresponding indicating. visibleiportion of one of said disks.

characters on their front and rear surfaces, Des Moines, Iowa, April 24:, 1917. handles on said disks, said plates having 7 openings whereby the adjacent portions of CORA J. SPOOR.

each pair of disks may be viewed from the PAUL A. TRAUTMAN.

Copies-10.1wthimpatentmaywbe;obtained forrfive-cents each, by addressing the,commissioner oPPatenta,

- Washington, 1320.1? 

